1 files changed, 2 insertions, 1 deletions

diff --git a/src/lj_udata.c b/src/lj_udata.c
index b2ea8031..a0edd0df 100644
--- a/src/lj_udata.c
+++ b/src/lj_udata.c
@@ -47,9 +47,10 @@ void *lj_lightud_intern(lua_State *L, void *p)
       if (segmap[seg] == up)  /* Fast path. */
         return (void *)(((uint64_t)seg << LJ_LIGHTUD_BITS_LO) | lightudlo(u));
     segnum++;
+    /* Leave last segment unused to avoid clash with ITERN key. */
+    if (segnum >= (1 << LJ_LIGHTUD_BITS_SEG)-1) lj_err_msg(L, LJ_ERR_BADLU);
   }
   if (!((segnum-1) & segnum) && segnum != 1) {
-    if (segnum >= (1 << LJ_LIGHTUD_BITS_SEG)) lj_err_msg(L, LJ_ERR_BADLU);
     lj_mem_reallocvec(L, segmap, segnum, segnum ? 2*segnum : 2u, uint32_t);
     setmref(g->gc.lightudseg, segmap);
   }